21498767919 has 48 divisors (see below), whose sum is σ = 34646227200. Its totient is φ = 12766457088.

The previous prime is 21498767909. The next prime is 21498767947. The reversal of 21498767919 is 91976789412.

21498767919 is a `hidden beast` number, since 2 + 1 + 498 + 76 + 79 + 1 + 9 = 666.

It is not a de Polignac number, because 21498767919 - 2⁵ = 21498767887 is a prime.

It is a super-2 number, since 2×21498767919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21498767909) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3377662 + ... + 3384020.

It is an arithmetic number, because the mean of its divisors is an integer number (721796400).

Almost surely, 2^21498767919 is an apocalyptic number.

21498767919 is a deficient number, since it is larger than the sum of its proper divisors (13147459281).

21498767919 is a wasteful number, since it uses less digits than its factorization.

21498767919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7564 (or 7561 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The spelling of 21498767919 in words is "twenty-one billion, four hundred ninety-eight million, seven hundred sixty-seven thousand, nine hundred nineteen".